The official documentation is at: http://docs.alfresco.com
Content - Storage and retrieval of content (text/binary)
Actions and Rules - Provide services to allow actions to be executed manually and automatically, using rules, within a Repository.
Store - Approach for identifying Nodes and Stores within a Repository
Spaces - Intelligent hierarchical folder structure for organizing a content repository
Type Mechanism - Meta Data for describing Types (inheritance), properties, associations and behaviours
Security and Authentication - A description of the security framework.
Search Documentation - A description of the search syntax
Web-Client Framework - Use Spring and JSF to support the development of a portal based web-client framework and portlets
Component Library - Library of JSF components required to build the client applications
Desktop Integration Options - Investigation of Desktop Integration options
Space User Application - Full application client for managing and using Spaces
API Integration Issues - Page to discuss and note issues that the web-client team is having with the service APIs
Firefox Extensions - Investigations into Browser Integration
Core Support Frameworks
Spring is an application framework that includes AOP capabilities. See Cross Cutting Support.
Hibernate is an object-relational mapping technology
Lucene is an enterprise-scale full-text and metadata search engine
MyFaces is an implementation of Java Server Faces
Business Use Cases used in the defining the Alfresco system
Service Interface Standards - Some help to ensure that the public API is consistent
Services Framework - Architectural pattern for representing service, aspect and content type specific behaviour.
Candidate Frameworks lists and reviews the various Web UI frameworks freely available.
Candidate Portals lists and reviews the freely available portal frameworks.